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Interests In Associates And Joint Venture Entities - Summary of Major Shareholdings in Associates and Joint Venture Entities, Including their Profit/(Loss) (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Disclosure of significant investments in associates and joint ventures [line items]      
Share of operating profit of equity accounted investments $ 186 $ 300 $ 576
Samarco dam failure provision expense (70) (87) (429)
Profit from equity accounted investments, related impairments and expenses $ 116 $ 213 $ 147
Samarco Mineracao S.A. [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Ownership interest 50.00% 50.00% 50.00%
Share of operating profit of equity accounted investments $ (47) $ (50) $ (80)
Other [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Share of operating profit of equity accounted investments $ (51) $ (19) $ (80)
Carbones del Cerrejon LLC [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Ownership interest 33.33% 33.33% 33.33%
Share of operating profit of equity accounted investments $ 85 $ 87 $ 192
Compania Minera Antamina S.A. [member]      
Disclosure of significant investments in associates and joint ventures [line items]      
Ownership interest 33.75% 33.75% 33.75%
Share of operating profit of equity accounted investments $ 199 $ 282 $ 544